Radiation-induced Crosslinking of Hydrogenated Butadiene-nitrile Rubber (hnbr) in the Presence of Low-molecular Weight Compounds
Year: 2026
Type: article
Abstract: Radiation-induced crosslinking of hydrogenated butadiene–nitrile rubber (Therban 2207) in the presence of lowmolecular-weight compounds, including hexachloro-p-xylene (HCPX), 2-amino-4,6-bis(trichloromethyl)-s-triazine (ABTST), and dicumyl peroxide (DCP), was investigated after gamma irradiation over the absorbed dose range of 50...500 kGy. Using the sol-gel analysis method, the radiation-chemical yields, viscosity (η), the number of network chains (1/Mc), and the number of cross-linked molecules (1/Mnτ) were determined for each investigated system as functions of the absorbed dose. A mechanism for the radiation-induced transformation of hydrogenated butadienenitrile rubber (HNBR) in the presence of hexachloro-p-xylene (HCPX) is proposed. To achieve a higher degree of crosslinking, a combined crosslinking approach was applied to hydrogenated butadiene-nitrile rubber (HNBR), involving the combined effects of elevated temperature and ionizing gamma irradiation. It was found that exposure of the quasi-binary systems to γ-radiation leads to the formation of various ions, excited molecules, and free radicals. Recombination of free radicals, in turn, leads to the formation of –C=C– and –CO–O–O–CO– bonds. Physicochemical and spectroscopic methods revealed changes in the molecular structure of irradiated HNBR in quasi-systems. It was demonstrated that ABTST acts as a sensitizing agent in the absorbed dose range of 400...500 kGy.
Language: English
Subfield: Polymers and Plastics
Field: Materials Science
Domain: Physical Sciences
Open Access status: bronze
OpenAlex ID: W7204125903